detection

/**
 * @return {boolean} true whether inside a node application or not.
 **/
function isNode () {
  try {
    return "object" === typeof process && Object.prototype.toString.call(process) === "[object process]";
  } catch(e) {}
  return false;
}


/**
 * @return {boolean} true if inside a chrome extension or not
 **/
function isExtension () {
  try {
    return window.chrome && chrome.runtime && chrome.runtime.id;
  } catch(e) {}
  return false;
}

/**
 * @return {boolean} true if inside a react native app
 **/
function isReactNative () {
  try {
    return navigator && navigator.product == "ReactNative";
  } catch(e) {}
  return false;
}